JPS6058309A - Vacuum close adhesion packing method and product manufactured by said method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support member or a plate member for packaged products, and particularly relates to a method for manufacturing a support member suitable for vacuum tight packaging.Usually, in the close-contact packaging method, the support member is The product that has been subjected to L is surrounded by a Plus Boonx film that conforms to the product like a skin and is in close contact with the support member.In the vacuum seal packaging method, this film 1 and the support member are impermeable to debris. It creates a vacuum in the space containing the product.

In the field of packaging in general, and in particular in the field of Food True Z/J packaging, it is important that the packaged product does not change over time, is convenient to handle, and is resistant to careless handling and/or impact. Various methods are known for imparting properties such as gender.

In particular, the applicant's EPC patent application No. 83.300134.8
and Italian Patent Application No. 24284 A/82 dated November 15, 1982, the problem of wrinkles occurring when vacuum-tightly packaged products are coated with a sealing film, and the dimensions of the container in which the product is to be wrapped. A few methods have been proposed to solve the dependency problem.

With particular reference to Italian Patent Application No. 24284 A782, the invention provides a 1M method of using sheet-like support elements for products to be packaged that are substantially dish-shaped. The dish can be made from a multilayer film of suitable relative stiffness such that it can be self-supporting.

The use of these types of materials requires significant manufacturing costs. This is because, in addition to the cost of molding the sheet-like elements, the various layers must first be layered to form a film.
It costs a lot to make the number 1jr1) a Lee [, rl
l+elJmk〆1)-1=+1,14')*Alγ)
This is because the ML value increases to 1-"Note 41;-et. At the end of the packaging process, the containers that emerge from the exit IT1 end of the packaging machine in the form of a continuous web of parallel packaging are:
This must be done for several minutes, and consideration must be given to the fact that trimming is often undesirable.

Preferably, the bottom layer is permeable or partially permeable to air, and the F layer is made of an impermeable film that acts as a barrier to debris. (for example, of the supporting member)
Other [1
If there is an impermeable fill 1 that is not necessary, we must consider how much material resources are wasted. Furthermore, when a multi-layered laminated film is used, the surplus portion obtained by these operations cannot be utilized far. This is because these extra parts consist of different materials.

, 1-2 The first object of the present invention is to use a material 11 that is easily available on the market, without requiring an expensive and extra pre-laminating process. The object of the present invention is to overcome the above-mentioned drawbacks by providing a method for manufacturing containers, in particular for vacuum tight packaging.

Another object of the present invention is to reduce the cost of manufacturing the package without compromising sealing and vacuum retention.

Yet another object of the invention is to enable the recovery of surplus material obtained from trimming operations of packages.

A minor object of the invention is to select support members with a wide range of properties according to the requirements of the type of product being packaged and the type of packaging chosen.

In accordance with one aspect of the invention, a support member for vacuum packaging is manufactured, comprising the steps of forming a substrate made of a thermoformable material and coating the substrate with an impermeable film by means of an air pressure differential. A method is provided.

The substrate is preferably a single layer thermoformable material;
It can be permeable, semi-permeable or impermeable to air, and the support member can preferably be shaped like a dish with a northwardly extending wall. Suitable substrate materials are polystyrene, polypropylene, f! ! These are hynylidene copolymer, polycarbonate, acrylonitrile-based copolymer, and polyamide.

In a second embodiment of the invention, the substrate is molded to create the floor and sidewalls facing away from each other, and then the X
Provided is a method for manufacturing a dish-shaped support member for vacuum packaging, characterized in that the material is coated with an impermeable film. This impermeable film, also referred to as the first impermeable film, is smaller in size than the substrate and the trimmed material can be reused; the impermeable 44
It is preferable that #l can be saved. Furthermore, it is preferred that the impermeable film has at least one heat-weldable film.

Further, in the present invention, the product is placed on the support member according to the first and second aspects of Section L, and the product is wrapped and sealed in the first and second impermeable films under sterile and sealed conditions. There is provided a vacuum packaged product, preferably for vacuum tight packaging, which is produced by evacuating a gap between products.

Further features and advantages of the present invention will become apparent from the detailed description of a preferred series of dish manufacturing steps set forth below. Although this manufacturing process does not limit the present invention, it will be explained below with reference to an atomic drawing.

With reference to the accompanying drawings, the first step of the method according to the invention consists of forming a preferably thermoformable material in a manner known per se. This material may be rigid or flexible or extensible, and will hereinafter be generally referred to as the "matrix."

The substrate, generally designated 1, is shaped in a preforming section, preferably into a dish-like shape. A suitable g4 for thermoforming can be used for this purpose. In this case, the substrate has a dish-like shape defining a base 2, from which the opposing side walls extend as flared walls 3. This slope of the wall results in
As explained in No. A/82, the saturation properties can reduce or completely eliminate the formation of wrinkles in subsequent steps of coating the impermeable film as described in more detail below. Given.

One requirement regarding the material that can be used to manufacture the matrix is that it should be rigid, flexible or extensible, or permeable, semi-permeable or opaque. Also, it is possible for it to mature. The objects of the invention are preferably achieved with a single layer of unlaminated material. However, depending on the specific end purpose, laminated multilayer materials may be used.

For illustrative purposes, suitable materials for the above operations include polystyrene, polyvinylidene chloride, polypropylene, polycarbonate, acrylonitrile-based hexaconjugates,
and polyamides such as nylon 6. The thickness of the material used in this case must be taken into account to match the depth of thermoforming stretch and the expected final properties of the package.

According to the invention, the substrate produced in this way is coated with an impermeable film 5, by means of which the air pressure difference brings the film J. into close contact with the substrate. This air pressure difference is described, for example, in Italian patent application no. 24264 A/82,
It may be a vacuum device arrangement of the type exemplified in EPC Patent Application No. 83300+34.9 and British Patent No. 1307054. Adhering an impermeable film to a substrate is accomplished, for example, by using at least one heat welded sheet of such film adjacent to the substrate. Heat-activated adhesive coatings can be used to create heat-weldable surfaces.

Since the fill 1.5 can act as a gas barrier, it should be permeable to air or col! if the purpose of the substrate is to protect and reinforce the packaging. ': A substrate can be made from a transparent material.

As shown in FIG. 2, both the impermeable film and the substrate are
↓It is included in vacant room 6. Preferably, before entering the 1" upper cavity, the film is subjected to a preheating step to create a vacuum of 11" order in the upper part of the vacuum chamber.

This vacuum is created in the same way above the empty chamber j'. Next, air is introduced into the upper part 7, and the air between the upper chamber 7 and the lower chamber 8 is The difference in quality allows the impermeable film to adhere completely to the quality.

Once this operation is completed, the lower part of the vacuum chamber is returned to normal pressure, the tray or support member 8 is created, and the impermeable film and substrate are completely adhered to the tray.

As shown in FIGS. 4 and 5, - [On a guided scale, a number of pans are preformed side by side at the same time and then separated at a trimming point, not shown, after the packaging operation is completed. .

+IIt-shaped objects can be transferred to various packaging processes by arranging them in a row as shown in FIGS. 2 and 3, or by arranging them in a row as shown in FIGS. Both sides of the web of the sequentially arranged dishes, in both cases of juxtaposition, are generally provided with edges 10 for ease of gripping.
is provided, which is later cut off at the trimming site.

This edge is not part of the package and does not need to be covered with an impermeable filter. According to the method of the invention, therefore, it is possible to use an impermeable film having dimensions narrower than the effective width of the substrate, which width is less than 80 mm to provide an impermeable support for the product 11. It is passed through to cover just one area.

The uncovered areas projecting on the sides of the substrate thus create edges 10 to facilitate gripping.

Besides saving the material used to make the dish impermeable, this results in a surplus as a result of cutting off the edges for ease of gripping, which is due to the presence of material W. Even if it is dyed, it will not be dyed once, so it is suitable for circulation in the substrate manufacturing process.

4-During the impermeable film coating step, the wall 3 of the substrate
Tilting the impermeable film adheres to the substrate and prevents the film from wrinkling.

Packaging of products may be done in accordance with either of the following powers: According to the first method, the product 11 is placed on the bottom of the dish 9 and the second impermeable fill 1, +2 is placed on the Jl,'M table 1ni of the product-blood assembly +70 as described above. The vacuum treatment is carried out again to adhere the second impermeable film or gas barrier film 1 to the film 1.5 and the exposed surface of the product to be sealed, and the package is kept under penetration conditions.

In this case, it is important that the surface of the film I.5 in the area in contact with the substrate can be sealed to the film 12, and that the adhesive force to the film 12 is smaller than the adhesive force to the substrate. This is to prevent delamination or separation of the substrate and impermeable film that may occur when the package is opened.

For this purpose, the film 5 or 12 must be thermoweldable at least across the contact surfaces provided. i.e. an impermeable or gas barrier film 5
or 12 may be made of any known material capable of fulfilling the required functions, which are gas barrier properties and solubility to adjacent films. For example, laminated films can easily be used. Thus, the film 5 can be made from a three-layer laminate: two heat-weldable outer layers and an intermediate barrier layer.

Alternatively, the dish or support member of the present invention may be used, for example, as a conventional thermoformable dish containing the product to be packaged, preferably vacuum treated, and with a welded bond in the peripheral area around the product. Seal with transparent film.

The substrate can be made from cardboard if required.

Preferably it takes the form of a semi-finished product defining several separate dishes. A portion of the blank is die-cut to create an upwardly folded portion of the blank that will later become the generally upwardly facing sidewall of the finished dish. Since the cardboard is substantially non-stretchable (in contrast to the thermoformable substrate material used for the support members shown in the accompanying drawings), its placement allows the folding operation to define the edges of the pan. This arrangement not only lowers the floor in sections (or conversely raises edge sections in relation to the floor), but also lowers the floors closer together to facilitate folding of the side walls upwards. Preferably, the cardboard semi-finished product has the form of a continuous web, in which case this relative close interlocking of the beds takes place both in the transverse and longitudinal direction of the web.

The desired approximation movement of the floor of the semi-finished dish can be achieved by using a suction die mold which can extend the floor vertically downward and horizontally, move it laterally and bend the side walls upwards. The same suction die mold is then used to support the cardboard plate semi-finished product, consisting of a plate or a set of plates, in an upright configuration, while at the same time welding an impermeable covering film to the concave surface of the container and placing it in an upright position. can impart stability to semi-finished dishes.

The manufacture of the pan blank includes a notch that closes completely as the side wall of the pan rises upright, and this notch is held closed by a heat-softened, impermeable film adhered to the blank.

For the thermoformable dishes shown in the accompanying drawings, the product is placed on an impermeable film, which must by this time be attached to the substrate, and the product and this film are then separated by a close-packing method. Such lined support members can be easily used for vacuum seal packaging by being coated with an impermeable film.

Throughout the specification, "impermeable film" refers to a barrier film that is impermeable to air. Such a film preferably has an oxygen permeability of 4501111/
less than m2/day/atmosphere, more preferably at least 30
+sl/w2/day 1 atm. Such films are known in the art as "oxygen barrier films."

As described above, the present invention can be modified in many ways without departing from the spirit of the invention. Furthermore, when carrying out the invention, the materials used, as well as the dimensions and shape they happen to have, can be chosen to meet the requirements for the packaging of goods.

For example, a gas-impermeable tray member can form the outer wall of any package that holds the evacuated contents within the length limits of the chosen substrate.

Two plates of sufficiently rigid substrate material could be placed opposite each other on the rJ-i.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional view of the substrate manufacturing process, Figure 2 and tX
Figure S3 is a schematic cross-sectional view of the process of covering the substrate with an impermeable film 1, and Figures 4 and 5 show the same process as Figures 2 and 3, but with several A substrate for simultaneously making containers is shown. Figures 6 and 7 illustrate the sequential steps of one embodiment of the vacuum seal packaging method of the present invention, in which a sealing film is applied to the product on the resulting support member. FIG. 8 is a schematic sectional view of the vacuum tight packaging method of the present invention, and FIG. 9 is a sketch of the finished product. Patent Applicant: W.R.B.A. Page 1 Continued 0 Inventor: Gottfried Fono Bismarck 0 Inventor: Enzo BassalotteSwitzerland (Fude 4)-1095 Lieutli Ruddubladfuel 91

Claims (1)

[Claims] 1. Vacuum packaging, in particular, characterized in that it consists of the steps of molding a substrate from a material capable of ripening, and covering the substrate with an impermeable film by means of a difference in air pressure. A manufacturing method for supporting members used in 2. The method of claim 1, wherein the substrate is made from a single layer of thermoformable material that is permeable, semi-permeable or impermeable to air. 3. A method as claimed in claim 1 or claim 2, wherein the substrate is substantially dish-shaped defining a bottom, with flared side walls extending from the bottom portion. 4. The direction of a four-movement plate used in vacuum packaging, which forms a substrate with a floor part and an upwardly facing side wall, and then coats the substrate with an impermeable film by means of a difference in air pressure. L-5, the material used to make the substrate is selected from the group consisting of polystyrene, polypropylene, vinylitine chloride copolymer, polycarbonate, acrylonitrile-based copolymer and polyamide. 4. The method described in 1. 6. The method described in Claim 4 JJI, in which the substrate is cardboard and the plate is made by folding a semi-finished cardboard product. 7. The impermeable film is bonded to the substrate by heat welding b
Claim 1 having at least one functional aspect
~6q> The method described. 8. The method according to claim 1, wherein the film is adhered to the substrate by preheating it and applying the air pressure difference to thermally weld the substrate and film together. 9. The opaque and transparent film should be trimmed with J2 + ii
7. The force according to claims 1 to 8 having dimensions smaller than the effective dimensions of the substrate. 10. The maturing-formable substrate material is in contact with one side of it! Claims 1 to 5 have an impermeable film of 7.
, or a support member for product packaging made by the method described in items 7 to 9. 11. The support member of claim 10, wherein the substrate is made of a thermoformable material that is permeable, semi-permeable or impermeable to air. +2, -1 of the impermeable film and a second impermeable film, comprising a support member according to claim 8, and a second impermeable film adhered to the surface of the impermeable film for sterile sealing;
- a product is disposed between the first and second impermeable filters, the first and second films surround the product and the space therebetween is evacuated, and the second impermeable filter and the first Table 1m with an impermeable film is a vacuum packaged product having a surface that exhibits an adhesive force that is smaller than the adhesive force that exists at the contact surface between the first impermeable film and the substrate. 13. A method for manufacturing a support member, in particular for use in vacuum packaging, as claimed in claim 1 substantially as herein described. 14. Manufacturing instructions for support members, particularly for use in vacuum packaging, substantially as herein described and illustrated in the accompanying drawings. 15. A cardboard support member qualitatively as described herein. 16. Vacuum packaged articles qualitatively described herein and illustrated in the accompanying drawings.